After removing the clip, the SureFire M31 high mount should work I believe.
There are other mounts from other companies. If you are looking to cut corners and go cheap then I suggest you search some firearms forums such as www.AR15.com
Remove the bezel and with your thumb on the center of the clip push down slightly and forward (in the direction of the bezel) and it will slip right out if you have to force it STOP your doing something wrong hope this helps.
Either the SW02 (designed for use on a WeaponLight) or the Z48 Clickie intended for flashlights (same clickie - easy grip styling on the SW02 follows SW01 design)